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<!DOCTYPE html> <html> <body> <h1>JavaScript Numbers</h1> <h2>The Number.isInteger() Method</h2> <p>Number.isInteger() returns true if the value is an integer of the datatype Number:</p> <p id="demo"></p> <p>Number.isInteger() is not supported in Internet Explorer 11 and earlier.</p> <script> let result = "Is 123 an integer? " + Number.isInteger(123) + "<br>" + "Is 123 an integer? " + Number.isInteger(-123) + "<br>" + "Is '123' an integer? " + Number.isInteger('123'); document.getElementById("demo").innerHTML = result; </script> </body> </html>
